code: def fliplr(img):
      """flip horizontal"""
      img_flip = nd.flip(img, axis=3)
      return img_flip
  
file_path: gluon-cv/scripts/re-id/baseline/test.py
imports: from __future__ import print_function, division
  import mxnet
  import numpy
  from mxnet import gluon, nd
  from mxnet.gluon import nn
  from mxnet.gluon.data.vision import transforms
  from networks import resnet18, resnet34, resnet50
  import gluoncv
  from gluoncv.data.market1501.data_read import ImageTxtDataset
  import time, os, sys
  import scipy.io
  from os import path
label_desc: Use image node_id 3 for calling a global function with example usage: fliplr(img) and returns: img_flip